Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b550207791a2855…

MALICIOUS

PDF

91.6 KB Created: 2021-07-05 20:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 874add8d60ea42fb9546eed57c49b9a8 SHA-1: b0a5c65d8bda484d9883eae2a1dae8b344a7267d SHA-256: 3b550207791a28559a037444d9cde92e6283fbb406d9b453f19abe2a8687212c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing to numerous websites, many of which host other PDF files. This behavior is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ya-ke.cn/admin/upload/lipikegisosudovove.pdf
    • http://cesishotel.lv/res/wysiwyg/file/fofoxaromereve.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c9413d0c---zusutelopovafes.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dc1qgrd7d7i3g7aue3td0592jr/kojera.pdf
    • https://gruppopolidori.com/upload/image/file/5803671071.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/redowizemex.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8019c6afdc---26920342404.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45e2a5c3e---44663907144.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c6da1735d---siborixoxa.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o9olfoi3i84dn77cu7ugd2utf3/sapezi.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bapexovexijinepitu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4kv4c6vn9sni4g352vvlm3ap6/tajerepit.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8a7ffa796b7aaf684653092c54274e32/babaxumofoxevinesefasa.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783331e25b3---zalaxatijilule.pdf
    • https://cjsc.se/ckfinder/userfiles/files/xalowowoporerurizafeta.pdf
    • http://zrdb-drogbud.pl/Upload/file/rulitapurugevanidenuj.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96636fefb---webasizetisewirogusole.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/getbqe8u7kq1v7oaa09mso8bu2/63102230762.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f44d20ca4c---75666407135.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b08954d991e---rokekusumivuzun.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607803c2a60b2---95963499241.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b4a09b2da---bawuvokemezemuxexalefifen.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3f07726f3d919fcf621d3b8bf88b9465/82828592393.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc0a5f490---pekoxitib.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf982725---78154019000.pdf
    • http://ascensionchina.com/userfiles/file/zirujepera.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=present+perfect+simple+with+for+and+since+exercises
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff79.bin
f1f8bc616fe749a5e2b4309d0ae7a7a38fb07f609ab6aebfa4b4bd4e2bd9a68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 17332 bytes
font_01_sfnt_off00012cc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 16792 bytes
font_02_sfnt_off000144da.bin
05c4b1271db312136c9b7853856992281e63b31933119c458e20664a570ba053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 11076 bytes

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